Pressure-gage



.W. B. ANDERSON.

PRESSURE GAGE.

APPLICATION FILED DEC. 22, 1919.

Patented July 12, 1921.

Cit

UNITED STATES PATENT OFFICE.

WILLIAM BASIL ANDERSON, 0F MOLSON, WASHINGTON.

PRESSURE-GAGE.

To all whom t may concerns Be it knownk that I, W'ILLTAM B. ANDER- soN,a citizen of the United States, residing at Molson, in the county ofOkanogan and State ofW'ashington, have invented certain new and usefulImprovements in Pressure- Gages, and I do declare the following to be Vafull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to improvements in gages for indicating pressure,and it has more particular reference to an air gage which is especiallydesigned to be attached, either temporarily or permanently, to astandard type of tire-valve so as to indicate the pressure in the tireat all times and under all circumstances, thus obviating the necessityof attaching a gage to the tirevalve every time it is desired to knowthe pressure contained in the tire.

Another object of the invention is to provide a simple and effectivegage for the above mentioned purpose which is also compact, light inweight, one that may be readily attached to, and detached from thetirevalve, and one which is exceedingly inexpensive, yet highlyeflicient in use.

Other objects and advantages of the in.- vention will be apparent duringthe course of the following description.

In the accompanying drawings forming a part of this specification7 andin which like numerals are employed to designate like parts throughoutthe same,-

Figure l is an elevation of a gage constructed in accordance with myinvention.

Fig. 2 is a central vertical section on the plane of the line 2-2 ofFig. l.

Fig. 3 is a central longitudinal section on the plane of the line 3-3 ofFig. 2.

Fig. i is an elevation of a gage with the cover removed.

Fig. 5 is an enlarged detail view of a portion of the gage.

In the drawings, wherein for the purpose of illustration a preferredembodiment of my invention. is shown, the numeral l indicates asubstantially cylindrical casing which is provided with a removablescrew cover 2, the latter having a sight-opening 3, by means of whichthe gage is read. Vhile I have shown the cover 2 as being connected withthe casing l by screw-threads, I desire it to be understood that thiscover may be se- Specification of Letters Patent. Pgntd July 12, 192.1Application filed December 22, 1919.

Serial No. 345,458.

cured to the body7 of the casing in any other manner. Extending into thecasing l at points directly opposite each other are a pair of nipples fiand 5. The nipple 4: serves as an inlet nipple and is provided with anytype of a check-valve 6, so that an air pump may be connected to thisnipple in the usual manner. On the other hand, the

nipple 5 serves as an outlet nipple and this nipple is internallythreaded and is designed to be connected to a tire-valve.- I desire itto be understood that before my gage is attached to the tire-valve, Ifirst remove the usual check-valve from the tirevalve and place thischeck-valve in the internally threaded inlet Li. Air is fed from theinlet a to the outlet 5 by means of a substantially circular air conduitor pipe 7 which may be either cast integral with' these nipples et and 5or may be made separate from them1 or in. fact connected to them in anysuitable manner. As shown, pipe 7 is substantially circular in shape andis of a length equal to approximately three-quarters of thecircumference of the casing l. rIhe outlet 5 may be connected to pipe 7at any point, but it is preferably connected at a point intermediate itsends. `A cylinder 8 is connected to the opposite open end of theair-pipe 7 and is disposed in parallelism with the sight opening 3, itbeing slightly below said opening. This cylinder-8 is provided in'oneside with a slot 9, for a purpose which will hereinafter be' set forth.By reference to Fig. 5 it will be seen that the open end of the air-pipe7 extends through the open end of the cylinder 8 and into the interiorthereof, and secured to the open end o f the pipe 7 and also Adisposedin the cylinder 8 is an eX- pansible member l0 which is preferably inthe form of a rubber bag, being elongated when air is forced into it. Inorder to resist elongation and expansion of the bag l0, I provide aspring, preferably a coiled spring 11, which is also disposed in thecylinder 8. Interposed between the spring 1l and the expansible bag 10is a follower 12 which carries a pointer or indicator 13 which movesback and forth in the slot 9. As is obvious, this pointer 13 is designedto Coact with a graduated scale 14 also in the casing 1.

I desire it to be understood that the bag l0 is so connected to theair-pipe 7 that it may be readily removed and replaced should it becomedamaged. Spring 11 is also removable. ln order to accomplish the above`features any suitable arrangement oi the parts may be employed, such asfor example, the air-pipe 7 may be provided with a flange i on itsextreme end, and the open end of the bag l0 may be retained on thisflange by means oi' a cord or otheriiexible element 1.6 in Vthe mannershown more clearly in. Fig. 5. ln addition t0 the flange 15 the pipe Ymay also be provided' with a second threaded -flange 'i7 which willpermit itV to be held in engagement with the internally threaded Vopenend of the cylinder thus retaining the parts together.

Yl`he operation of the device is as tollows: As beifore stated, l iirstremove the checkvalve i'roin the tire-valve by means of a suitable valvetool and place this valve into the intermilly threaded nipple l of thegage. l`hen, ll screw the nipple 5 over the tirevalve so as to retainthe gage in position. l desire it to be understood that the outletnipple may either be internally threaded and lit over the tire-valve, orit may be externally threaded and be screwed into the tire-valve.However, this construction is immaterial. After the gage is in theposition just described, an ordinary bicycle pump will be connected tothe inlet nipple 4., whereby the desired amount oi air may be placed inthe tire in4 the usual manner. During the passage ot the air into theinner tube, a quantity of the air will also pass into the expansible bagl0 and cause it to expand, er rather, be elongated. Such elongation ofthe bag will cause the fol! lower 12 and the pointer i3 to move in adirection against the tension of the spring 11, and the pointer 13 willmove across the graduated scale 14 and indicate the pressure within thetire. that a driver may at all times know the pressure in the tires.

A device constructed in accordance with the foregoing` description willbe found eX- ceedinglyY useful to automobile owners, in that it willindicate at all times the pre Se, it will be seen,

sure within the tires, thus obviat-ing the necessity of using theordinary type oi tiregage every time it is desired to test the tires. Vith this device it will not bel neces sary to remove the gage at anytime, and it is ci such construction that it will enable the operator tojudge just how much air to place in his tires because of the 'tact thatthe gage will register during the pumping of the air into the tires. inthis way the car owner is not very liable to blow-out his tires becauseoi an excessive amount of air being pumped'into them. lilith the ordi-Vnary tirefgage it is ,necessary pump air into the tire, then disconnectthe pump and test the' tire, if the desired `amount of air has not beenplaced in the tire it is necessary to again attach the pump and placemore Vair in the tire until, the desired pressure is obtained. lli/lygage overcomesv this disadvantage. K'

Tfrom the Joregoing description taken in connection with theaccompanying drawings it is believed that the manner oic using, and mainadvantages oi'iny tire-gage are entirely clear, there-fore, furtherdescription is deemed unnecessary.

l. claim: v K

A pressure gage comp ising a cylinder7 open atene end and provided inone side with a slot which terminates adjacent ythe opposite endthereof, an vair conduit ertending into and closing the open end oi"said cylinder, an expansible bag arranged in theV cylinder and connectedatV open end to said conduit, a coiled spring arranged in the cylinderbetween the closed end thereci and the closed end of said bag', `a diskfollower in the cylinder between the bag` andthe spring, a pointer fixedto said follower and extending through the slot in the cylinder, agraduated scale in close proximity tothe pointer whichcoacts with it,and means for connecting the conduit toa tire valve. A

In testimony whereof I have hereunto set my han( l. WXLLIAM BASILANDERSON.

